Ive had the docs for decades and installed kits when building HL-2200's for
local Heathkit stores.
Carl
----- Original Message -----
From: "Jim W7RY" <w7ry@inbox.com>
To: "Jim W7RY" <w7ry@inbox.com>; "Carl" <km1h@jeremy.mv.com>;
<Gudguyham@aol.com>; <Amps@contesting.com>
Sent: Thursday, April 14, 2011 12:01 AM
Subject: Re: [Amps] Which hearhkit amp would you choose?
> Carl.
> Here is a place to download the entire service bulletin that deals with
> the switch enhancements using a relay.
>
> HL-2200-AC Service Bulletin is located at
> http://www.tech-systems-labs.com/heathkitdata.htm
>
> 73
> Jim W7Ry
>
>
> --------------------------------------------------
> From: "Jim W7RY" <w7ry@inbox.com>
> Sent: Wednesday, April 13, 2011 7:42 PM
> To: "Carl" <km1h@jeremy.mv.com>; <Gudguyham@aol.com>;
> <Amps@contesting.com>
> Subject: Re: [Amps] Which hearhkit amp would you choose?
>
>> Ok Carl...
>> The kit is Heathkit part number 830-94. I is simply to increase the
>> capacity
>> of the power switch with a relay.
>>
>> This guy is so miss informed (like me so YOU say) that he installed the
>> power switch mod AND a Harbaugh step start mod in the same amplifier!
>> Please
>> see the picture!! BTW, the resistors near the relay are for dropping the
>> coil voltage when the amp is used on 240 volts. Oh, and Heathkit used the
>> exact relay for switching the AC in the Heathkit SB-1000.
>> http://www.pestingers.net/HL2200.htm
>>
>>
>> Please see Heathkit Mod # HL-2200-4
>> http://www.tech-systems-labs.com/service/hl2200.txt
>>
>>
>> I just shake my head Carl...
>>
>> 73
>> Jim W7RY
>>
>>
>> --------------------------------------------------
>> From: "Carl" <km1h@jeremy.mv.com>
>> Sent: Wednesday, April 13, 2011 6:25 PM
>> To: "Jim W7RY" <w7ry@inbox.com>; <Gudguyham@aol.com>;
>> <Amps@contesting.com>
>> Subject: Re: [Amps] Which hearhkit amp would you choose?
>>
>>> Negative is wrong Jim.
>>>
>>> Its called a step start and serves the function it was designed for.
>>> There
>>> is no other reason to use a step start in a SB-220 as the transformers
>>> are
>>> current limited, the switch is the weak link and pretty unobtanium. When
>>> switching to more C in the PS then it will also help there.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "Jim W7RY" <w7ry@inbox.com>
>>> To: "Carl" <km1h@jeremy.mv.com>; <Gudguyham@aol.com>;
>>> <Amps@contesting.com>
>>> Sent: Wednesday, April 13, 2011 8:30 PM
>>> Subject: Re: [Amps] Which hearhkit amp would you choose?
>>>
>>>
>>>> Negative Carl.
>>>>
>>>> The upgrade was to simply save the power switch. It installed a relay
>>>> to
>>>> switch the high current AC carried by the front panel switch.
>>>>
>>>> 73
>>>> Jim W7RY
>>>>
>>>>
>>>> --------------------------------------------------
>>>> From: "Carl" <km1h@jeremy.mv.com>
>>>> Sent: Wednesday, April 13, 2011 6:05 AM
>>>> To: <Gudguyham@aol.com>; <Amps@contesting.com>
>>>> Subject: Re: [Amps] Which hearhkit amp would you choose?
>>>>
>>>>> Step Start; early production offered an upgrade kit
>>>>>
>>>>> Metering component changes
>>>>>
>>>>> Relative power pot was a failure point, not needed
>>>>>
>>>>> Improved grid cap values...carried over from SB-221
>>>>>
>>>>> Extra safety margin in HV bypass after RFC-2
>>>>>
>>>>> Carl
>>>>> KM1H
>>>>>
>>>>>
>>>>> ----- Original Message -----
>>>>> From: <Gudguyham@aol.com>
>>>>> To: <km1h@jeremy.mv.com>; <mike.lyon@gmail.com>; <Amps@contesting.com>
>>>>> Sent: Wednesday, April 13, 2011 8:52 AM
>>>>> Subject: Re: [Amps] Which hearhkit amp would you choose?
>>>>>
>>>>>
>>>>>> What improvements over an SB-221? Did away with the sensitivity
>>>>>> control
>>>>>> (cheaper). No lighted meters (cheaper) . Circuit improvements over
>>>>>> an
>>>>>> SB-221? What. if you don't like green, I guess it is MUCH more
>>>>>> attractive.
>>>>>>
>>>>>>
>>>>>> In a message dated 4/13/2011 8:42:32 A.M. Eastern Daylight Time,
>>>>>> km1h@jeremy.mv.com writes:
>>>>>>
>>>>>> HL-2200 if you can find one. It is a reboxed SB-221 for the most
>>>>>> part
>>>>>> but
>>>>>> includes enough circuit improvements to make it attractive.
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>>
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>>>
>>>
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